Journal
PHYSICS LETTERS B
Volume 807, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.physletb.2020.135577
Keywords
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Funding
- NSFC [11875113, 11375153, 11675145]
- Shanghai Municipality [KBH1512299]
- Fudan University [JJH1512105]
- Swedish Research Council [621-2013-4287, 2016-05996]
- European Research Council (ERC) under the European Union's Horizon 2020 research and innovation programme [668679]
- Ministry of Education, Youth and Sportsof the Czech Republic [LT17018]
- COST Action [CA16201]
- Center for Research and Development in Mathematics and Applications (CIDMA) through the Portuguese Foundation for Science and Technology (FCT - Fundacao para a Ciencia e a Tecnologia) [UIDB/04106/2020, UIDP/04106/2020]
- national funds (OE), through FCT, I.P.
- Enabling Green E-science for the Square Kilometer Array Research Infrastructure(ENGAGESKA) [POCI-01-0145-FEDER-022217]
- Spanish grant (AEI/FEDER, UE) [SEV-2014-0398, FPA2017-85216-P]
- Spanish grant (Generalitat Valenciana) [PROMETEO/2018/165]
- Spanish Red Consolider MultiDark [FPA2017-90566-REDC]
- [PTDC/FIS-PAR/31000/2017]
- [CERN/FIS-PAR/0027/2019]
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We investigate the production of primordial Gravitational Waves (GWs) arising from First Order Phase Transitions (FOPTs) associated to neutrino mass generation in the context of type-I and inverse seesaw schemes. We examine both high-scale as well as low-scale variants, with either explicit or spontaneously broken lepton number symmetry U(1)(L), in the neutrino sector. In the latter case, a pseudo-Goldstone majoron-like boson may provide a candidate for cosmological dark matter. We find that schemes with softly-broken U(1)(L), and with single Higgs-doublet scalar sector lead to either no FOPTs or too weak FOPTs, precluding the detestability of GWs in present or near future measurements. Nevertheless, we found that, in the majoron-like seesaw scheme with spontaneously broken U(1)(L), at finite temperatures, one can have strong FOPTs and non-trivial primordial GW spectra which can fall well within the frequency and amplitude sensitivity of upcoming experiments, including LISA, BBO and u-DECIGO. However, GWs observability clashes with invisible Higgs decay constraints from the LHC. A simple and consistent fix is to assume the majoron-like mass to lie above the Higgs-decay kinematical threshold. We also found that the majoron-like variant of the low-scale seesaw mechanism implies a different GW spectrum than the one expected in the high-scale seesaw. This feature will be testable in future experiments. Our analysis shows that GWs can provide a new and complementary portal to test the neutrino mass generation mechanism. (C) 2020 The Authors. Published by Elsevier B.V.
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